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Low-speed coal mill

Low-speed coal mill is best represented by ball mill of drum-type, which is usually called steel ball

mill or ball mill for short. It is a totating cylinderical rotary drum. In some cases, the top and the bottom of the rotary drum are conical. With steel balls in it, the revolving speed of the rotary drum is 15~25 r/min. When working, the steel balls keeps hitting and crushing the coal and makes it into pulverized coal. Hot air in the rotary drum will dry the coal and then send it out of the rotary drum. After separated by separator, pulverized coal with certain particle size will be sent to bunker or directly burned. Usually, a ball mill is heavy and huge with high power consumption and big noise. But it is suitable for different types of coal and especially suitable for hard anthracite.

Working principles of coal mill

Coal mill is the machinery which crush coal and ground coal into power, it is important auxiliary equipment. for coal-powder boiler. Coal grinding process is the process of crushing coal and increasing its surface area. To increase the surface area,must overcome the binding force between the solid molecules,therefore, requires the energy consumption. Coal in the mill is made of pulverized coal, mainly through crushing, impacting, and grinding in three ways. Which the crushing process consumes the least energy. Grinding process consumes the most energy. A variety of coal mill in

the milling process, has the above-mentioned two or three ways, But what is considered mainly depending on the type of coal mill.

Application of coal mill:

Coal mill are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced. Various classifiers, such as screens, spiral classifiers, cyclones and air classifiers are used for classifying the discharge from ball mills. Ball mill is an efficient tool for grinding many materials into fine powder. The ball mill is used to grind many kinds of mine and other materials, or to select the mine. It is widely used in building material, chemical industry, etc. There are two ways of grinding: the dry process and the wet process. It can be divided into tabular type and flowing type according to different forms of discharging material.

hot selling high efficiency low-speed ball coal mill